/Engine/Source/Runtime/Engine/Classes/Animation/IAttributeBlendOperator.h
Invoked when two or multiple sets of attribute container inputs are to be blended together
void Blend ( const [FAttributeBlendData](API\Runtime\Engine\Animation\FAttributeBlendData) & BlendData, [FStackAttributeContainer](API\Runtime\Engine\Animation\FStackAttributeContainer) * OutAttributes ) const